Its comeing from where the red wire attaches to the top of the transformer,
to somewhere under the magnets (i really don't know much about it), i looked
close and i think one of the magnets is broken.
You may have two problems: (1) Excessive high voltage which caused (2) the
flyback to arc. Or, it may just be a crack in the insulation as someone else
As a test, you can try insulating the area with several layers of electrical
tape and/or non-acidic RTV Silicone sealer or HV sealer. If the monitor
then works normally, a new flyback should take care of it.
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